Steam-boiler.



PATENTED JAN. 30, 1906.

M. JANOWITZ.

STEAM BOILER.

APPLIOATION FILED MAY 25v 1905.

""" JNVENTOR TTTTED STATES PATENT UTTT@E.

MYER JANOWITZ, OF SIOUX CITY, IOWA, ASSIGNOR TO ROSE JANOW'ITZ, OF SIOUX CITY, IOWVA.

STEAM-BOILER.

Specification of Letters Patent.

Patented Jan. 30, 1906.

T0 at whom-it may concern.-

Be it known that I, MYER J ANOWITZ, a citizen of the United States, residing at Sioux City, in the county of Woodbury and State of Iowa, have invented new and useful Improvements in SteamBoilers, of which the following is a specification.

This invention is an upright tubular boiler; and the object thereof is to reduce the first cost of such a boiler and also to produce one which will last longer.

It is common to make upright tubular boilers with a water leg extending down around the lire-box and formed by a continuation of the flue-sheet, and thereby forming the fire box lining. This has the defect that corrosion is very apt to occur at the riveted joint at the bottom of the water-leg, which thereby shortens the life of the boiler. The construction is also expensive.

The boiler invented by me dispenses with the water-leg, the flue-sheet being secured to the shell above the fire-box. A cast-iron lining is put inside of the fire-box, with an asbestos backing on the outside of said lining, and an airspace is formed between the asbestos and the shell of the boiler. This airspace is open at both top and bottom, permitting a free circulation around the fire-box lining and preventing the burning out of the water-leg incident to the old construction mentioned, and also preventing the burning out of the boiler-shell. The cost is also considerably less than that of similar boilers having the water-leg referred to.

In the accompanying drawings, Figure 1 is a horizontal section of the boiler through the fire-box. Fig. 2 is a vertical sectional elevation.

Referring specifically to the drawings, (1 indicates the boiler-shell, gthe lower flue-sheet, and h the fiues or tubes. As shown, the fluesheet extends straight across the shell, and its flanged edge is riveted thereto, the tubes being expanded into the sheet in the usual manner. Hand-holes '1', are made in the shell of the boiler on a line with the top of the fluesheet, so that the scale and sediment can be cleaned out, thereby increasing the life of the flue-sheet.

The fire-box under the flue-sheet has a cast-iron lining a, on the outside of which is an asbestos protective backing b. The firebox lining so formed is spaced from the surrounding shell of the boiler, forming a continuous air-space c, which is open at the top and bottom and, in connection with the asbestos lining, prevents burning out of the boiler-shell by transmitted heat. The casting and asbestos backing rests upon lugs f and are held in place by bolts e, which extend through the lining, the backing, and the shell. Sleeves e on the bolts preserve the space between the fire-box lining and the shell. The grate-bars it rest upon thelugs f, With the ash-pit below formed, as shown, by the extended shell of the boiler.

As shown there is no pressure on the boiler-shell below the rivet-line in the bottom flue-sheet, and should the bottom of the boilershell corrode it consequently makes no material diflerence, owing to the absence of such pressure. The construction cheapens the cost of a boiler considerably as compared with those having a waterleg, without loss to any material advantage. The use of the cast-iron firepot is advantageous, particu larly in view of the protection afii'orded by the air-space and asbestos to the shell of the boiler.

What I claim as new, and desire to secure by Letters Patent, is

In an upright-flue boiler, the combination with an outer shell extended below the lower flue-sheet and around the fire-box, of a firepot within said shell and spaced at all points therefrom, comprising a cast-iron lining and a backing of non-heat-conducting material.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MYER J ANOWITZ.

Witnesses:

C. SIEKER, T. A. BLooK. 

